What is it about?
This chapter explains the main types of fuel cells that can be used in cogeneration systems, which produce both electricity and useful heat at the same time (often called CHP). Fuel cells work by converting the chemical energy in a fuel and an oxidant directly into electricity through spontaneous electrochemical reactions, rather than by burning the fuel. Their efficiency depends on the theoretical voltage and on losses that occur during operation, especially at low and high current levels. Fuel cells are grouped by the temperature at which they run and by the type of electrolyte they use. Low-temperature cells include proton-exchange-membrane fuel cells (PEMFCs) and direct-methanol fuel cells. Intermediate-temperature cells include alkaline and phosphoric-acid fuel cells. High-temperature cells include molten-carbonate and solid-oxide fuel cells, sometimes combined with gas turbines. The chapter then focuses on the proton-exchange-membrane fuel cell. Developed by General Electric in the 1960s for space applications, a PEMFC uses a special polymer membrane that lets protons pass from the anode to the cathode while electrons travel through an external circuit to produce power. Hydrogen is oxidised at the anode, oxygen is reduced at the cathode, and the only products are electricity, water, and heat—making the technology clean and suitable for combined heat-and-power systems.
Featured Image
Photo by Joseph Greve on Unsplash
Why is it important?
As the world seeks cleaner, more efficient ways to generate electricity and heat, fuel cells (especially PEMFCs) offer a practical route to high-efficiency cogeneration with very low emissions. Understanding their operating principles, temperature ranges, and electrochemical behaviour helps engineers and decision-makers choose the right technology for different applications, from buildings and industry to distributed power. This knowledge is particularly timely for reducing reliance on conventional combustion systems, improving overall energy efficiency, and supporting the transition to low-carbon energy systems.
Perspectives
Fuel cells turn the fundamental chemistry of redox reactions into useful work with far fewer losses than traditional engines. The PEMFC stands out because of its relatively low operating temperature, rapid start-up, and clean water-only exhaust—qualities that make it attractive for many real-world CHP settings. Seeing how the membrane electrode assembly and the simple hydrogen–oxygen reactions come together reminds us that elegant electrochemical design can deliver both electricity and recoverable heat. As someone who values clear physical principles, I find the classification by electrolyte and temperature especially useful: it gives a practical map for matching technology to application rather than treating all fuel cells as the same.
Professor Rosenberg J Romero
Universidad Autonoma del Estado de Morelos
Read the Original
This page is a summary of: Selected Fuel Cells for Cogeneration CHP Processes, January 2011, Springer Science + Business Media,
DOI: 10.1007/978-1-84996-028-1_3.
You can read the full text:
Resources
Contributors
The following have contributed to this page
